added support to view a detailed information about a library dataset.
Merge branch 'master' of https://github.com/Takadonet/bioblend
Merge pull request #45 from Takadonet/master

Add support to view detailed information about a dataset in a data library
galaxy/histories: added a method for retrieving datasets by name
galaxy/workflows: added a method for deleting workflows
galaxy/libraries: added show_folder